[crankshaft] Support calling JS runtime functions.

src/ast/ast-numbering.cc

Index: src/ast/ast-numbering.cc
diff --git a/src/ast/ast-numbering.cc b/src/ast/ast-numbering.cc
index 9c3aa04f0e9e15b7adfab13aa2ab184ba893952f..c2b70cf3c328abc2d0a3149c0bad2a1b08646d06 100644
--- a/src/ast/ast-numbering.cc
+++ b/src/ast/ast-numbering.cc
@@ -266,10 +266,6 @@ void AstNumberingVisitor::VisitFunctionDeclaration(FunctionDeclaration* node) {
 void AstNumberingVisitor::VisitCallRuntime(CallRuntime* node) {
   IncrementNodeCount();
   ReserveFeedbackSlots(node);
-  if (node->is_jsruntime()) {
-    // Don't try to optimize JS runtime calls because we bailout on them.
-    DisableCrankshaft(kCallToAJavaScriptRuntimeFunction);
-  }
   node->set_base_id(ReserveIdRange(CallRuntime::num_ids()));
   VisitArguments(node->arguments());
 }